Through the cracks.

The still summer sky shuddered with pain as something tore it open from the other side and squeezed its way into the world, leaving a twisted black gash in the air. Had anyone been watching at the moment of the tear, they would have seen something bleed through, then rapidly descend with a gaseous slither.

It lingered when it reached the level of the grassy hillside, not occupying space but instead shunting space aside, like parting a curtain. For a few moments, reality was an ocean, and it was a bubble. Then the void ruptured, and the world rushed in to engulf the presence that it had contained.